In situations where more than one worker is providing service to a client (e.g. threesomes) it is necessary to ensure that equipment such as vibrators and dildos is not used by one person and then another without being cleaned, disinfected and having a new condom put on first. Ideally each worker should have her/his own toys and equipment, which are not used by other workers. Each worker may choose to use a condom of a different colour in order to identify who has used the dildo last.408K PDF Link (Thanks, Derek!)
Update: Michael sez, "the Australian Capital Territory (the DC equiv) has had one since 1989. The Aussie/Kiwi rivalry goes way beyond cricket and rugby."
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.